20+20r=20r-5r-15

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Solution for 20+20r=20r-5r-15 equation: 



20+20r=20r-5r-15

We move all terms to the left:

20+20r-(20r-5r-15)=0

We add all the numbers together, and all the variables

20r-(15r-15)+20=0

We get rid of parentheses

20r-15r+15+20=0

We add all the numbers together, and all the variables

5r+35=0

We move all terms containing r to the left, all other terms to the right

5r=-35

r=-35/5

r=-7

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